Okay well my teacher gave me this sheet where you can prepare for the test that will be the next day. The thing is that the sheet consists of questions but no numbers or anythin' so you just have to figure it out how do approach the problems. I have most of them figured out but there might be a few that might have more than one way to do it and just making sure if there is or not.(adsbygoogle = window.adsbygoogle || []).push({});

1. Caculate the average force supplied by the brakes to stop the roller coaster given its initial velocity and stopping distance. What I think I have to do here to get the answers if there were number are:

V1 =

delta D =

V2 =

This is to find the acceleration, then

Fnet = Fbrakes

= ma

2. In the absence of friction, calculate the maximum velocity of the roller coaster given the height of the first hill.

V1 = 0

h2 = 0

Etotal1 = Etotal2

Eg1 + Ek1 = Eg2 + Ek2

Eg1 + Ek1 = Ek2

gh1 + 1/2 v1^2 = 1/2 v2^2

3. In the absence of friction, calculate the velocity oat any other point along the track given the height of the track.

Etotal1 = Etotal2

gh1 + 1/2v1^2 = 1/2 v2^2

5. Given the actualy maximum velocity of the roller coaster, calculate the energy lost to heay and noise during its descent on the first hill.

Eg - Ek = Ebust

(mgh)-(1/2mv^2) = E2

6. Given the force applied by the chain and pulley system to drag the roller coaster up to the first hill, calculate its efficiency.

%eff = deltaE/W * 100

deltaE = ma (delta D)

w = F * delta D

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# Homework Help: Motion, Work, Energy, and Power

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